This is a command you see mentioned alot by Gentoo monkeys. They say to use it after every update of GCC, any library you might use and glibc. They argue that compiling and recompiling everything like this will optimize the system alot more because you are recompiling the entire system (gcc, glibc etc) with nativly compiled versions of themselves. Same goes for all libraries etc. I doubt the difference in working speed is really worth the hours and hours you end up having your computer compile the same stuff again and again though.

http://superuser.com/questions/9847/linux-utility-for-finding-the-largest-files-directories

Replaces tabs in output with spaces. Uses perl since sed seems to work differently across platforms.

Replace FILE with a filename (or - for stdin).

Shows a single line per interface (device), with its IPv4 settings. Shorter command, better readability in output. Show Sample Output

After you install slocate ,the first thing you have to do with it to initialise the database by issuing a command " slocate -u" . And then onwards just give the filename or dirname as a argument to the slocate command will reveal the files/dirs location in the system along with path.Moreover over it's an securely way of looking into the file system. Show Sample Output

file displays a files type the -L flag means follow sym-links (as libraries are often sym-linked to another this behavior is likely preferred) more complex behavior (*two* grep commands!) could be used to determine if the file is or is not a shared library.

Now a bit of explanation required for this command.Once you type the command it opens up an vi editor with an temporary file enlisting the password file information .So if you make an change it will not reflected in the passwd file until you save the file.The reason behind using this command over other way to view the password file in network environment is that it locks the password file when you start working with it.So no one can temper with it during that period.Once you are done(means you save the tmp file) ,it will release the lock associated with it.I think it's a better mechanism to view the sensitive data like passwd file.Never ever use other tool like cat, nano or any other means. Show Sample Output

In bash, by pressing ALT+n and then a character x, x will be printed n times I know is not the same as the original command, but is correlated. Show Sample Output

For those days when you need to know if something is happening because the day ends in "y". Show Sample Output

Take a picture from your webcam and save it to a jpeg. A very slightly modified version of MarxBro's command.

If you follow my previous posting regarding "vipw" then no explanation required.The same method goes behind this command also.It will open an tmp file in vi editor to give you the enlisting to edit the group file.And most importantly to attach a lock with it.Once you are done ,the lock is released and the changed reflected to the original file.So you can securely edit the group file over the network without the fear of being tampered . Show Sample Output

Good if you have your music like Artist/(Year) Album/Song

If you follow my other posting regarding "vipw" and "vigr' then no explanation required.It has done the same thing as did with those two command.Open the /etc/sudoers file and attach a lock with it. Once you are done with it ,the lock gets released and the changes reflected to the original file.It will open a tmp file in vi editor to give you the chance to edit the sudoers file securely.visudo parses the sudoers file after the edit and will not save the changes if there is a syntax error. Upon finding an error, visudo will print a message stating the line number(s) where the error occurred and the user will receive the "What now?" prompt. At this point the user may enter "e" to re-edit the sudoers file, "x" to exit without saving the changes, or "Q" to quit and save changes. The "Q" option should be used with extreme care because if visudo believes there to be a parse error, so will sudo and no one will be able to sudo again until the error is fixed. If "e" is typed to edit the sudoers file after a parse error has been detected, the cursor will be placed on the line where the error occurred (if the editor supports this feature). PS: Although I have had experienced myself and few people shown to me that it behaves badly in some distribution ,noteably SLES.But the problem can be rectified with little caution. Show Sample Output

This is quite usefull in Unix system share via NFS or AppleTalk with OSX clients that like to populate your filesystem with these pesky files

Once it is connected to the remote server by that ssh protocol,the mentioned command will start working on that server.

sending packet by ping if sending more high packet root needed... Show Sample Output

lista diret?rio Show Sample Output

If you leave out the block size it defaults to 512 bytes. I set it to 16 Megabytes and it was much faster...

Taskkill: As the name of the utility ?taskkill? suggests that it is simply used to see the running processes and to kill one or more processes either by using its PID i.e. ProcessID or by using its Image name i.e. by which it is present in system and being executed. We can also filter the results on the basis of user name, PID, image name, CPU time, memory usage etc at the time of killing or terminating a process. Syntax: taskkill [/s [/u [\] [/p []]]] {[/fi ] [...] [/pid /im ]} [/f] [/t] Parameters description: /s :- To provide IP specification or name of the remote computer; if not provided local computer is considered. Do not use backslashes in the value of the parameter. /u \ :- To provide UserName or Domain\UserName under whose permission command should execute. If not provided then command run under the permission of person who is logged on. Option /u can be used only if /s is specified. /p :- For the password of that user account which is provided with /u parameter. Password is prompted in case this field is omitted. /fi :- To apply filter to select a set of tasks. Wildcard character (*) can be used for specifying all tasks or image names. Filter names are provided after parameter description. /pid >ProcessID> :- For specifying PID of the process to be killed. /im :- For providing image name of the process to be terminated. Also Wildcard character (*) can be used to specify all image names. /t :- To terminate the whole tree of the process including all child processes started by it. /f :- For forceful termination of process. It is not omitted in case of remote process as they are terminated forcefully in default. Filters description: Filters are provided to filter the result. This filtering is based on some Filter names which are checked with some relational operators. You will observe that the filter names are the column names which comes in task manager. Filter Name Valid Operators Valid Values STATUS eq,ne RUNNINGNOT RESPONDINGUNKNOWN IMAGENAME eq, ne Name of image PID eq, ne, gt, lt, ge, le ProcessID number SESSION eq, ne, gt, lt, ge, le Session number CPUTIME eq, ne, gt, lt, ge, le CPU time in the format HH:MM:SS, where MM and SS are between 0 and 59 and HH is any unsigned number MEMUSAGE eq, ne, gt, lt, ge, le Memory usage(in KB) USERNAME eq, ne Any valid user name (User or Domain\User) SERVICES eq, ne Service name WINDOWTITLE eq, ne Window title MODULES eq, ne DLL name where eq, ne, gt, lt, ge & le are meant for equal to, not equal to, greater than, less than, greater than equal to and less than equal to respectively. Points to be noted: In case of remote process WINDOWTITLE and STATUS filters are not supported. Wildcard (*) character is accepted for /im option only when filter is applied. Not necessary that /f is specified in case of remote process termination as in default that is terminated forcefully. Don?t specify computer name to HOSTNAME filter as it will result in a shutdown and all processes are stopped. For specifying ProcessID (PID) tasklist command can be used. Examples: To terminate a process with PID 3276 use parameter /pid. ?taskkill /pid 3276 To terminate more than one process with pid as 2001, 2224, 4083. ?taskkill /pid 2001 /pid 2224 /pid 4083 To terminate a process with its image name like wmplayer.exe for Windows Media Player use /im parameter. ?taskkill /im wmplayer.exe To terminate a process and all its child process i.e. to end process tree in task manager use /t parameter. ?taskkill /f /im explorer.exe /t To terminate all those processes which have PID greater than or equal to 1500 without considering their image names use filter ge with wildcard character. ?taskkill /f /fi ?PID ge 1500? /im * To terminate the process tree with PID 2521 which is started by account name admin. ?taskkill /pid 2521 /t /fi ?USERNAME eq admin? To terminate all process beginning with note on a remote system named serverpc under user name ?administrator? having its password as ?qu@dc()r3?. ?taskkill /s serverpc /u administrator /p qu@dc()r3 /fi ?IMAGENAME eq note*? /im * To terminate a process with its windows title as ?paint? ?taskkill /f /fi ?WINDOWTITLE eq paint? Source: http://unlock-windows.blogspot.com/2008/12/taskkill-command-line-utility.html Show Sample Output